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GARDNER WARREN; 0F BOSTON, s'sxenon TO WILLIAM M. BYRNES, OF CHARLESTOWN,- MASSACHUSETTS.

Letters Patent li a-81,850; dated September 1, 1868.

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Be it'known that I, GARDNER WARREN, of Boston, in the county of Suffolk, andStato of Massachusetts, have invented a new and useful Device or FixturetotbeAttached to Sliding Windows, Doors, and Blinds; and

I do hereby declare the following to be a full, clear, and 'exaet description of the some, rofereneo boing had to the accompanying drawings, making a part of this specification, in which- Figure 1 is an eleyation of a window-frame and sash embodying my invention.

I -Figure.2--is a horizontal section on line a b on fig. 1.

'Figure fi is an end view of the compensating-spring. I

It is afiwell-known fact' that sliding windows, doors, and blinds are subject to great changes consequent yupon changes in the atmosphere, so that windows fitted up in the usual manner are .very loose in warm, dry

weather, so that dustin large quantities finds its way into the house, and also in dry, cold-weather in the winter? the'windows rattle, arid the cold air finds its way very readily into the house; but-afow days or even hours of wet weather will swell them so tight that it is almost impossible to raf'n or lower them till 'dry' weather again appears.

To meet this difficulty and remedy these evils is the object of my invention; and it consists inflapplying to an ordinary window-frame, what I call a compensating-spring, madcof metal, the form of which I make as shown in figs. 2 and 3, as being preferable, though it may he made of various forms I I This spring should extend the whole height of the window-frame in cases where the sash has a movement equal tothe height of the sash in the frame, or, in other words,.the'spriiig in all cases should have a length equal to the height of the sash and the l ngth-of its movement combined. V

In the drawings, AA represent the jambs of an ordinary window-frame; B is the sash, with its-two vertical edges worked to a half circle or'nezlrly so; G C are stop-beads, screwedto' tLe frame, and so'shapcd that when in position, they form a semicircular groove for the sash to slide in. The other edge of the sash slides in a semicircular groove foi-medin the spring D. The spring D-is attached to the frame by. means of the straight lipqor flange a. The stop-bead E is split into two pieces, and the lip oi: the spring placed between them, and the whole is then screwed to the frame in such a manner as to leave-suliicient space between the curved portion .of the spring and thejainb oi' the frame, to allow forgll swelling that will be likely to occur The stop Fmust be sofitted as not to interfercwith the free action of the spring D, i

i have described my invention as being applied to a window in which the sash moves vertically, but I wish it to be understood thatI do not confine myself, to such applieation, for I think it is evident that it may be applied to'o window, door, or blind when they are made to slide, whether vertieallyor horizontally. It may also be reversed, and attached to tho'sash, door, or blind.

What/I claim-and desire to secure by Letters Patent, is-

The metallic springD with the flange a, when constructed and applied. substantially as described,- and for the purposes set forth.- l Y Executed at Boston, this 10th daylof January, 1868. V

GARDNER WARREN Witnesses:

N, 0. Loninsnn,

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